Go take a picture with the inventor of the daguerreotype photographic process.

This stately mansion, built in 1787 by America's first Secretary of the Navy, is rumored to be one of the most haunted buildings in Washington, DC.

Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

Housing the National Women's Party since 1929, this historic house is now a monument to the fight for gender equality.

The oldest building in the District of Columbia was preserved because of a mistaken connection to George Washington.

Decades before the scandal, this staircase on the river was a literal "water gate."

Home to a vast and influential collection of Shakespeareana.

Cold War intelligence agents monitored communist embassies from an attic in a former pigeon coop.

The house where John Wilkes Booth conspired with his co-conspirators.

There's a crumbling old mansion inside the Smithsonian National Zoo.

This imposing Masonic temple a mile from the White House was the first public library in Washington, D.C.

The famous abolitionist’s preserved estate is one of Washington's finest monuments to its great Black citizens.

Government testing at the asylum briefly explored using marijuana as a "truth serum" on Nazi prisoners of war.

A Spiritualist house of worship where believers communicate with the dead in the spirit world.

This stunning blue and gold room changed cities twice before becoming part of the Smithsonian.

People escaping slavery may have hidden inside a corpse vault.

A painfully obvious spy house sits right across the street from the Russian Embassy.

A wondrous old library overlooking the nation's capital.

A tiny piece of the Moon is embedded in this stained glass masterpiece.

A historic neighborhood church is reborn as a psychedelic arts collective.

Long-abandoned trolley tunnels just a mile away from the White House are turning into an art space.

Franciscan monks created a facsimile of the Holy Land for North Americans who couldn’t afford the trip overseas.

With over 100 jam-packed rooms to explore plus elaborate tea services and events, the Mansion on O Street is a hidden treasure.

Home to items never before seen by the public.